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signed by是过去分词做后置定语。 said that后是宾语从句，表示说的具体内容。as he put it是插入语，如果去掉也不影响句子成分完整性。
2.Witnesses said the protest appeared to be a reaction to the fight at the Vienna temple where armed men with knives and a pistol attacked the preachers during a religious ceremony.
Witnesses said 后所有部分都是宾语从句，表示说的具体内容。where armed men……是定语从句，指代Vienna temple。during a religious ceremony是状语。